Java 中的 LinkedBlockingQueue 迭代器()方法
原文:https://www . geeksforgeeks . org/linkedblockingqueue-iterator-method-in-Java/
LinkedBlockingQueue 的迭代器()方法以适当的顺序返回与这个 LinkedBlockingQueue 相同元素的迭代器。从这个方法返回的元素包含了从 LinkedBlockingQueue 的第一个(头)到最后一个(尾)的所有元素。返回的迭代器弱一致。 语法:
public Iterator<E> iterator()
返回值:该方法按照从第一个(头)到最后一个(尾)的顺序返回与 LinkedBlockingQueue 中存在的元素相同的迭代器。 下面的程序说明了 LinkedBlockingQueue 类的迭代器()方法: 程序 1: 从 LinkedBlockingQueue 创建一个迭代器，其中包含一个类的不同学生的名字。
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program Demonstrate iterator()
// method of LinkedBlockingQueue
import java.util.concurrent.LinkedBlockingQueue;
import java.util.Iterator;
public class GFG {
public static void main(String[] args)
{
// define capacity of LinkedBlockingQueue
int capacityOfQueue = 7;
// create object of LinkedBlockingQueue
LinkedBlockingQueue<String> linkedQueue
= new LinkedBlockingQueue<String>(capacityOfQueue);
// Add element to LinkedBlockingQueue
linkedQueue.add("John");
linkedQueue.add("Tom");
linkedQueue.add("Clark");
linkedQueue.add("Kat");
// create Iterator of linkedQueue using iterator() method
Iterator<String> listOfNames = linkedQueue.iterator();
// print result
System.out.println("list of names:");
while (listOfNames.hasNext())
System.out.println(listOfNames.next());
}
}
Output:
list of names:
John
Tom
Clark
Kat
程序 2: 从包含员工列表的 LinkedBlockingQueue 创建迭代器。
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program Demonstrate iterator()
// method of LinkedBlockingQueue
import java.util.concurrent.LinkedBlockingQueue;
import java.util.Iterator;
public class GFG {
public void collectIterator()
{
// define capacity of LinkedBlockingQueue
int capacityOfQueue = 7;
// create object of LinkedBlockingQueue
LinkedBlockingQueue<Employee> linkedQueue
= new LinkedBlockingQueue<Employee>(capacityOfQueue);
// Add element to LinkedBlockingQueue
Employee emp1 = new Employee("Sachin", "Developer", "39000");
Employee emp2 = new Employee("Sanjeev", "Tester", "26000");
// Add Employee Objects to linkedQueue
linkedQueue.add(emp1);
linkedQueue.add(emp2);
// create Iterator of linkedQueue using iterator() method
Iterator<Employee> listOfEmployee = linkedQueue.iterator();
// print result from iterator
System.out.println("list of Employees:");
while (listOfEmployee.hasNext()) {
System.out.println("*************************");
Employee emp = listOfEmployee.next();
System.out.println("Employee Name : " + emp.name);
System.out.println("Employee Position : " + emp.position);
System.out.println("Employee Salary : " + emp.salary);
}
}
// create an Employee Object with name,
// position and salary as an attribute
public class Employee {
public String name;
public String position;
public String salary;
Employee(String name, String position, String salary)
{
this.name = name;
this.position = position;
this.salary = salary;
}
@Override
public String toString()
{
return "Employee [name=" + name + ", position="
+ position + ", salary=" + salary + "]";
}
}
// Main Method
public static void main(String[] args)
{
GFG gfg = new GFG();
gfg.collectIterator();
}
}
Output:
list of Employees:
*************************
Employee Name : Sachin
Employee Position : Developer
Employee Salary : 39000
*************************
Employee Name : Sanjeev
Employee Position : Tester
Employee Salary : 26000
参考:https://docs . Oracle . com/javase/8/docs/API/Java/util/concurrent/linkedblockingqueue . html #迭代器–
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